Question

我正在使用django创建三个定义商店的表，它的商品列表和价目表。在'price_list'模型中，我创建了指向其他两个表的外键链接，我后来使用这些表来使用unique unique选项创建compisite主键。这一切都在没有错误的情况下验证，但是当我尝试通过管理界面更改“price_list”时，我会收到上述帖子标题中所述的错误。对其他两个型号的编辑继续进行，没有任何故障。据我了解，错误是说与business表的主键链接的外键为null。如何自动生成值？

请帮忙

models.py

from django.db import models

class Businesses(models.Model):
    business_name = models.CharField(max_length=50, unique=True)
    telephone_number = models.CharField(max_length=15)
    where = models.ManyToManyField('Location', verbose_name='where?')

    def __unicode__(self):
        return self.business_name

    class Meta:
        ordering = ['business_name']


class Location(models.Model):
    located_at = models.CharField(max_length=30)
    city = models.CharField(max_length=30)
    country = models.CharField(max_length=30)

    def __unicode__(self):
        return u'%s' % (self.located_at)

    class Meta:
        ordering = ['located_at']


class Item_list(models.Model):
    item_name = models.CharField(max_length=50, unique=True)

    def __unicode__(self):
        return self.item_name

    class Meta:
        ordering = ['item_name']


class Price_list(models.Model):
    price_list_id = models.AutoField(primary_key=True)
    price = models.IntegerField(max_length=50)
    business_id = models.ForeignKey(Businesses, related_name='businessID')
    item_id = models.ForeignKey(Item_list, related_name='ItemID')
    business_name = models.ForeignKey(Businesses, to_field='business_name', related_name='businessName')
    item_name = models.ForeignKey(Item_list, to_field='item_name', related_name='itemName')

    def __unicode__(self):
        return u'%s' % self.price

    class Meta:
        ordering = ['price']
        unique_together = (("price_list_id", "business_id", "item_id"),)

admin.py

from django.contrib import admin
from biaSearch.app.models import *

class BusinessAdmin(admin.ModelAdmin):
    list_display = ('business_name', 'telephone_number')
    search_field = ('business_name')
    filter_horizontal  = ('where',)

class LocationAdmin(admin.ModelAdmin):
    list_display = ('located_at', 'city', 'country')
    search_field = ('located_at')
    list_filter = ('located_at', 'city')

class Item_listAdmin(admin.ModelAdmin):
    list_display = ('item_name',)

class Price_listAdmin(admin.ModelAdmin):
    list_display = ('price',)
    fields = ('price', 'business_name', 'item_name')


admin.site.register(Businesses, BusinessAdmin)
admin.site.register(Location, LocationAdmin)
admin.site.register(Item_list, Item_listAdmin) 
admin.site.register(Price_list, Price_listAdmin)

Answer 1

我怀疑你在Price_List的“businessID”的外键定义中错过了大写B.

我不确定，但我认为整个“related_name ='businessID'”参数是不必要的，因为您想要为Businesses表的主键创建外键。

尝试一下 - 它可能会有效！

在/ admin / app / price_list / add /（1048，“列'business_id_id'不能为空”的IntegrityError）

1 个答案: